181

180 ← 181 → 182
← 180 181 182 183 184 185 186 187 188 189 → ← 100 110 120 130 140 150 160 170 180 190 → ← 0 100 200 300 400 500 600 700 800 900 →
읽는 법	백팔십일
세는 법	백여든하나
한자	百八十一
소인수 분해	소수
로마 숫자	CLXXXI
2진수	10110101₂
3진수	20201₃
4진수	2311₄
5진수	1211₅
6진수	501₆
8진수	265₈
12진수	131₁₂
16진수	B5₁₆
20진수	91₂₀
36진수	51₃₆
φ(181)	180
σ^*(181)	182
d(181)	2
σ(181)	182
μ(181)	-1
M(181)	-4
수 목록 · 정수
v t e

181(백팔십일)은 180보다 크고 182보다 작은 자연수다.

수학

42번째 소수(素數)다. 앞의 소수는 쌍둥이 소수인 179, 다음 소수는 191이다.
- 9번째 회문 소수다. 앞의 회문 소수는 151, 다음은 191이다.
피타고라스 삼조의 빗변의 길이이다. ( $19^{2}+180^{2}=181^{2}$ )^[a]
$181=9^{2}+10^{2}$ $181=9^{2}+10^{2}$
- 10번째 중심있는 사각수로, 연속하는 두 자연수의 제곱합으로 나타낼 수 있다. 앞의 중심있는 사각수는 145, 다음은 221이다.
9번째 중심있는 오각수다. 앞의 중심있는 오각수는 141, 다음은 226이다.

교통

일본 181번 국도: 오카야마현 쓰야마시에서 돗토리현 요나고시까지 이어지는 일본의 국도.

군사

U-181(영어판, 독일어판): 제2차 세계 대전에 사용된 나치 독일의 군용 잠수함. 일본 제국에 인수되기도 했다.

문화유산

방송

스카이라이프의 BTN 불교TV 채널 번호.
지니 TV의 MTN 머니투데이방송 채널 번호.
U+ TV의 OBS W 채널 번호.

기타

연도: 181년, 기원전 181년

각주

↑ 361 + 32,400 = 32,761

이 글은 숫자에 관한 토막글입니다. 여러분의 지식으로 알차게 문서를 완성해 갑시다.

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